Technical Information
ISO Tolerances
The tolerances shown in this table are normally applied to metric sizes of drawn, turned and ground finish bright steel bars.
Tolerances in millimetres.
The total tolerance is taken under.
| Nominal Sizes (mm) | h11 | h10 | h9 | h8 | h7 |
|---|---|---|---|---|---|
| >1 to 3 | 0.060 | 0.040 | 0.025 | 0.014 | 0.010 |
| >3 to 6 | 0.075 | 0.048 | 0.030 | 0.018 | 0.012 |
| >6 to 10 | 0.090 | 0.058 | 0.036 | 0.022 | 0.015 |
| >10 to 18 | 0.110 | 0.070 | 0.043 | 0.027 | 0.018 |
| >18 to 30 | 0.130 | 0.084 | 0.052 | 0.033 | 0.021 |
| >30 to 50 | 0.160 | 0.100 | 0.062 | 0.039 | 0.025 |
| >50 to 80 | 0.190 | 0.120 | 0.074 | 0.046 | 0.030 |
| >80 to 120 | 0.220 | 0.140 | 0.087 | 0.054 | 0.035 |
| >120 to 180 | 0.250 | 0.160 | 0.100 | 0.063 | 0.040 |
The tolerances shown in this table are normally applied to imperial sizes of drawn, turned and ground finish bright steel bars.
Tolerances in Inches.
The total tolerance is taken under.
| Nominal Sizes (inch) | h11 | h10 | h9 | h8 | h7 |
|---|---|---|---|---|---|
| >3⁄64 to 1⁄8 | 0.00240 | 0.00157 | 0.00098 | 0.00055 | 0.00039 |
| >1⁄8 to 15⁄64 | 0.00295 | 0.00189 | 0.00118 | 0.00071 | 0.00047 |
| >15⁄64 to 1⁄64 | 0.00354 | 0.00228 | 0.00142 | 0.00087 | 0.00059 |
| >25⁄64 to 45⁄64 | 0.00433 | 0.00275 | 0.00169 | 0.00106 | 0.00071 |
| >45⁄64 to 13⁄16 | 0.00511 | 0.00331 | 0.00205 | 0.00130 | 0.00082 |
| >13⁄16 to 2 | 0.00629 | 0.00393 | 0.00244 | 0.00153 | 0.00098 |
| >2 to 31⁄8 | 0.00748 | 0.00474 | 0.00291 | 0.00181 | 0.00118 |
| >31⁄8 to 4 | 0.00866 | 0.00551 | 0.00342 | 0.00213 | 0.00137 |
| >4 to 73⁄32 | 0.00984 | 0.00629 | 0.00393 | 0.00248 | 0.00157 |